20858733761 has 2 divisors, whose sum is σ = 20858733762. Its totient is φ = 20858733760.

The previous prime is 20858733737. The next prime is 20858733851. The reversal of 20858733761 is 16733785802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20855692225 + 3041536 = 144415^2 + 1744^2 .

It is a cyclic number.

It is not a de Polignac number, because 20858733761 - 2⁶ = 20858733697 is a prime.

It is a super-3 number, since 3×20858733761³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (20858732761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10429366880 + 10429366881.

It is an arithmetic number, because the mean of its divisors is an integer number (10429366881).

Almost surely, 2^20858733761 is an apocalyptic number.

It is an amenable number.

20858733761 is a deficient number, since it is larger than the sum of its proper divisors (1).

20858733761 is an equidigital number, since it uses as much as digits as its factorization.

20858733761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 20858733761 in words is "twenty billion, eight hundred fifty-eight million, seven hundred thirty-three thousand, seven hundred sixty-one".